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PIANO TUNING PIN.

Patented Apr. 5, 1887.

WITNESSES: I fiw w UNITED STATES PATENT. OFFICE.

PAUL THEOPHIL BALTHASAR BERNER, OF BERLIN, GERMANY.

' PIANO TUNING-PIN.

SPECIFICATION forming part of Letters Patent No. 360,409, dated April 5, 1887.

Application filed May 12, 1856.

.To all whom it may concern.-

Be it known that I, PAUL THEOPHIL BAL- THASAR BERNER, of Berlin, in the Kingdom of Prussia, Empire of Germany, have invented certain new and useful Improvements in Tuning Devices for Pianos, of which the following is a specification.

This invention relates to certain new and useful improvements in devices for turning the pins to which the strings of a piano are secured; and the object of my invention is to provide a tuning device which is simple in construction, effective in use, and specially adapted where a number of strings are to be tuned to the same pitch.

The invention consists in a suitable block or casing, wormwheels in said casing engagingwith'screw-threads or worms formed on the tuning-pins, the strings being secured to pro- 2ojecting parts on the ends of the said wormwheels, all as will be described and set forth hereinafter, and pointed out in the claim. In the accompanying drawings, Figure 1 is a longitudinal side view of my improved tuning device. 2 is a plan view oftlie same. Fig. 3 is a sectional plan view of the same. Fig. 4 is a longitudinal sectional view of the same. Fig. 5 is alongitudinal sectional view of the block or casing in which the tuning-pins are held. Fig. 6 is a side view of the same. Fig. 7 is an end view of the tuning device. Fig. 8 is a crosssectional view on the line zz, Fig. 3. Fig. 9 is a longitudinal view of one of the tuning-pins. Fig. 10 is a plan View of one of the rollers, the pin being shown in section.

Similar letters of reference indicate corresponding parts.

The block or casing A is provided with the end lugs, a, through which the screws a are passed into the frame D. The block or casing A is provided with one, two, or three circular apertures, 12, for receiving rollers B, each of which is provided in its circumference with a groove, 0, in which a worm-thread is cut, the worm-thread of each roller engaging with a screw-thread or worm, a, formed on the tuning-pin G, the tuning-pins each being provided below the screw with a narrow part, 0 fitting into a suitable socket in the bottom part of vertical apertures 0, extending from the top of the block or casing A downward.

Serial No.201,924. (No model.)

The tuning-pins are each provided above the screw-thread or worm with a collar, and

above the same with a square or polygonal part, c", for applying the tuning-key. Each roller B is provided at one end with a laterally-projecting part, I), flanged at its outer end, and provided with an aperture, b", for receiving the end of the string, the several strings being passed through the agraife D on the frame of plate D. Two or three rollers are provided in each block or casing A, according to the number of strings that are to be tuned to the same pitch. That roller B nearest the agraffe D is preferablyraised, as indicated in Fig. 1, so that the strings secured to the following rollers cannot come in contact with the wedge of the first roller 13. The tuning-pins C have bearings at their upper and lower ends, so that they can be turned without binding, and do not offer any undue resistance.

\Vhen the tuning-pins are turned by means of a tuningkey of the usual construction, the rollers B are also turnedby the worm-thread, and thestrings are either wound upon the projecting parts of said rollers or unwound from the same. The strings are all held firmly and securely, as the rollers cannot revolve the tuningpins.

The above-described device can be applied to any piano without requiring any changein the construction of the same.

Having thus described my invention, I claim as new and desire to secure by Letters Patent In a tuning device for pianos, the combination, with a block or casing having apertures PAUL 'IIIEOPHIL BAL'llIASAR BERNER.

Witnesses:

H. SoHLoss. 

